(a) Except as provided under Section (k) of this rule, on and after the date on which the initial performance test
is completed or is required to be completed under Rule 260.8 of this Regulation, whichever date comes first, no
owner or operator of an affected facility subject to the provisions of this rule which combusts only coal, oil,
or natural gas shall cause to be discharged into the atmosphere from that affected facility any gases which contain
nitrogen oxides (expressed as NO2) in excess of the following emission limits: (Rev. Effective 9-21-93)

(Figures in parenthesis represent lbs/million BTU heat input)

FUEL/STEAM GENERATING UNIT TYPE

NITROGEN OXIDES1

(1)

Natural gas and distillate oil, except (4):

(i) Low heat release rate

(ii) High heat release rate

43 (.10)

86 (.20)

(2)

Residual oil:

(i) Low heat release rate

(ii) High heat release rate

130 (.30)

170 (.40)

(3)

Coal:

(i) Mass-feed stoker

(ii) Spreader stoker and fluidized bed combustion

(iii) Pulverized coal

(iv) Lignite, except (v)

(v) Lignite mined in North Dakota, South Dakota, or Montana and combusted in a slag tap furnace

(vi) Coal-derived synthetic fuels

210 (.50)

260 (.60)

300 (.70)

260 (.60)

340 (.80)

210 (.50)

(4)

Duct burner used in a combined cycle system:

(i) Natural gas and distillate oil

(ii) Residual Oil

86 (.20)

170 (.40)

1. Emission limits ng/J (lbs/BTU)
(expressed as NO2) heat
input.

(b) Except as provided under Section (k) of this rule, on which the initial performance test is completed or
is required to be completed under Rule 260.8 of this Regulation, whichever date comes first, no owner or operator
of an affected facility which simultaneously combusts mixtures of coal, oil, or natural gas shall cause to be discharged
into the atmosphere from that affected facility any gases which contain nitrogen oxides in excess of a limit determined
by use of the following formula:

Hgois the heat input from combustion of natural gas or distillate oil,

ELrois the appropriate emission limit from Subsection (a)(2) for combustion of residual oil,

Hrois the heat input from combustion of residual oil,

ELcis the appropriate emission limit from Subsection (a)(3) for combustion of coal, and

Hcis the heat input from combustion of coal.

(c) On and after the date on which the initial performance test is completed or is required to be completed
under Rule 260.8 of this Regulation, whichever comes first, no owner or operator of an affected facility which
simultaneously combusts coal or oil, or a mixture of these fuels with natural gas, and wood, municipal-type solid
waste, or any other fuel shall cause to be discharged into the atmosphere any gases which contain nitrogen oxides
in excess of the emission limit for the coal or oil, or a mixture of these fuels with natural gas combusted in
the affected facility, as determined pursuant to Sections (a) or (b) of this rule, unless the affected facility
has an annual capacity factor for coal or oil, or mixture of these fuels with natural gas of 10 percent (0.10)
or less and is subject to a federally enforceable requirement which limits operation of the facility to an annual
capacity factor of 10 percent (0.10) or less for coal, oil, or a mixture of these fuels with natural gas.

(d) On and after the date on which the initial performance test is completed or is required to be completed
under Rule 260.8 of this Regulation, whichever date comes first, no owner or operator of an affected facility which
simultaneously combusts natural gas with wood, municipal-type solid waste, or other solid fuel, except coal, shall
cause to be discharged into the atmosphere from that affected facility any gases which contain nitrogen oxides
in excess of 130 ng/J (0.30 lbs/million BTU) heat input unless the affected facility has an annual capacity factor
for natural gas of 10 percent (0.10) or less and is subject to a federally enforceable requirement which limits
operation of the affected facility to an annual capacity factor of 10 percent (0.10) or less for natural gas.

(e) On and after the date on which the initial performance test is completed or is required to be completed
under Rule 260.8 of this Regulation, whichever date comes first, no owner or operator of an affected facility which
simultaneously combusts coal, oil, or natural gas with byproduct/wastes shall cause to be discharged into the atmosphere
from that affected facility any gases which contain nitrogen oxides in excess of an emission limit determined by
the following formula unless the affected facility has an annual capacity factor for coal, oil, and natural gas
of 10 percent (0.10) or less and is subject to a federally enforceable requirement which limits operation of the
affected facility to an annual capacity factor of 10 percent (0.10) or less.

ELcis the appropriate emission limit from Subsection (a)(3) for combustion of coal, and

Hcis the heat input from combustion of coal.

(f) Any owner or operator of an affected facility which combusts byproduct/waste with either natural gas or
oil may petition the Administrator within 180 days of the initial startup of the affected facility to establish
a nitrogen oxides emission limit which shall apply specifically to the affected facility when the byproduct/waste
is combusted. The petition shall include sufficient and appropriate data, as determined by the Administrator, such
as nitrogen oxides emissions from the affected facility, waste composition (including nitrogen content), and combustion
conditions to allow the Administrator to confirm that the affected facility is unable to comply with the emission
limits in Section (e) of this rule and to determine the appropriate emission limit for the affected facility.

Any owner or operator of an affected facility petitioning for a facility-specific nitrogen oxides emission
limit pursuant to this rule shall:

(i) Demonstrate compliance with the emission limits for natural gas and distillate oil in Subsection (a)(1)
or for residual oil in Subsection (a)(2) of this rule, as appropriate, by conducting a 30-day performance test
as provided in Rule 260.46b(e). During the performance test only natural gas, distillate oil, or residual oil shall
be combusted in the affected facility; and

(ii) Demonstrate that the affected facility is unable to comply with the emission limits for natural gas and
distillate oil in Subsection (a)(1) or for residual oil in Subsection (a)(2) of this rule, as appropriate, when
gaseous or liquid byproduct/ waste is combusted in the affected facility under the same conditions and using the
same technological system of emission reduction applied when demonstrating compliance under Subsection (f)(1)(i)
of this rule.

The nitrogen oxides emission limits for natural gas or distillate oil in Subsection (a)(1) or for residual
oil in Subsection (a)(2) of this rule, as appropriate, shall be applicable to the affected facility until and unless
the petition is approved by the Admin-istrator. If the petition is approved by the Administrator, a facility-specific
nitrogen oxides emission limit will be established at the nitrogen oxides emission level achievable when the affected
facility is combusting oil, natural gas and byproduct/waste in a manner which the Administrator determines to be
consistent with minimizing nitrogen oxides emissions.

(g) Any owner or operator of an affected facility which combusts hazardous waste (as defined by 40 CFR Part
261 or 40 CFR Part 761) with natural gas or oil may petition the Administrator within 180 days of the initial startup
of the affected facility for a waiver from compliance with the nitrogen oxides emission limit which applies specifically
to that affected facility. The petition must include sufficient and appropriate data, as determined by the Administrator,
on nitrogen oxide emissions from the affected facility, waste destruction efficiencies, waste composition (including
nitrogen content), the quantity of specific wastes to be combusted and combustion conditions to allow the Administrator
to determine if the affected facility is able to comply with the nitrogen oxides emission limits required by this
rule. The owner or operator of the affected facility shall demonstrate that when hazardous waste is combusted in
the affected facility, thermal destruction efficiency requirements for hazardous waste specified in an applicable
federally enforceable requirement preclude compliance with the nitrogen oxides emission limits of this rule. The
nitrogen oxides emission limits for natural gas or distillate oil in Subsection (a)(1) or for residual oil in Subsection
(a)(2) of this rule, as appropriate, are applicable to the affected facility until and unless the petition is approved
by the Administrator. [See 40 CFR 761.70 for regulations applicable to the incineration of materials containing
polychlorinated biphenyls (PBC's)].

(h) The nitrogen oxide standards under this rule apply at all times including periods of startup, shutdown or
malfunction.

(i) [RESERVED]

(j) Compliance with the emission limits under this rule is determined on a 24-hour average basis for the initial
performance test and on a 3-hour average basis for subsequent performance tests for any affected facilities that:
(Effective 9-21-93)

Combust, alone or in combination, only natural gas, distillate oil, or residual oil with a nitrogen content
of 0.30 weight percent or less;

Have a combined annual capacity factor of 10 percent or less for natural gas, distillate oil, and residual
oil with a nitrogen content of 0.30 weight percent or less; and

Are subject to a federally enforceable requirement limiting operation of the affected facility to the firing
of natural gas, distillate oil, and/or residual oil with a nitrogen content of 0.30 weight percent or less and
limiting operation of the affected facility to a combined annual capacity factor of 10 percent or less for natural
gas, distillate oil, and residual oil and a nitrogen content of 0.30 weight percent or less.

(k) Affected facilities that meet the criteria described in Subsections (j)(1), (2), and (3) of this rule, and
that have a heat input capacity of 73 MW (250 million BTU/hour) or less, are not subject to the nitrogen oxides
emission limits under this rule. (Effective 9-21-93)